21213611540104 has 16 divisors (see below), whose sum is σ = 39780740951820. Its totient is φ = 10605413952960.

The previous prime is 21213611540101. The next prime is 21213611540153. The reversal of 21213611540104 is 40104511631212.

It can be written as a sum of positive squares in 2 ways, for example, as 19463996887204 + 1749614652900 = 4411802^2 + 1322730^2 .

It is not an unprimeable number, because it can be changed into a prime (21213611540101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173912359 + ... + 174034294.

Almost surely, 2^{21213611540104} is an apocalyptic number.

It is an amenable number.

21213611540104 is a deficient number, since it is larger than the sum of its proper divisors (18567129411716).

21213611540104 is a wasteful number, since it uses less digits than its factorization.

21213611540104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347954280 (or 347954276 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 21213611540104 in words is "twenty-one trillion, two hundred thirteen billion, six hundred eleven million, five hundred forty thousand, one hundred four".